STRESS STRAIN ANALYSIS OF STANDARD AND HIGH STRENGTH CONCRETE

International Journal of Mechanical and Production Engineering Research and Development (IJMPERD) ISSN (P): 2249–6890; ISSN (E): 2249–8001 Vol. 10, Issue 3, Jun 2020, 4273–4278 © TJPRC Pvt. Ltd.

STRESS STRAIN ANALYSIS OF STANDARD AND HIGH STRENGTH CONCRETE BITTLA SUDHEER1 & JAGDISH CHAND2 1

Research Scholar, Masters in Structural Engineering, Chandigarh University (CU), Mohali, Punjab, India 2

Associate Professor, UIE-Civil Engineering, Chandigarh University, Mohali, Punjab, India

ABSTRACT This documentation presents the analysis of standard and high strength concrete with stress-strain relation. Many researchers have been performed on stress-strain analysis by using UTM machineries and other analytical works, but this paper includes usage of Compress meter for finding of stress-strain analysis. To know the perfect behaviour of any material we need to analyze ultimate strength, strain and its maximum elasticity, and the values obtained are clearly mentioned in the main content in form of tables and graphs. We all know that high strength concrete is the higher load resistance material obtained by reducing water-cement ratio and adding super plasticizers. This research work includes the different trial works to obtain high strength concrete and the maximum obtained strength is 77.1 N/mm2 and other values are clearly mentioned in conclusion and graphs with different curing periods (i.e. 14, 28, 56, 90 days of curing).

Received: Jun 10, 2020; Accepted: Jun 30, 2020; Published: Jul 21, 2020; Paper Id.: IJMPERDJUN2020407

INTRODUCTION We all know that different types of researches are going on concrete from the past two decades, different types of

Original Article

KEYWORDS: Ultimate Strength, UTM Machines, Elasticity, Compress Meter

materials and chemicals are developed to obtain the high strength concrete by replacing the cement and other materials of concrete. Here in this research work I have been replaced the cement with silica fume and reduced the water-cement ratio to 0.23 and added the Tamcem 60R superplasticizer.

High strength concrete is very much different from the standard concrete in form of strength, materials, mixing, etc. The main important features of high strength concrete are higher load resistance, against chemical attacks, durability, etc.

MATERIALS AND TRIALS FOR HIGH STRENGTH CONCRETE There is no specific code for the high strength concrete mean like standard concrete, one has to perform different trial methods until they obtain the designed high strength concrete. Here I have mentioned the materials and the specific codes used.

Cement-OPC 43 grade and tests are performed according to IS-12269-1989.

Aggregates- Tests are performed according to IS: 2386 (part 1-8).

Water- bacterial free water and codes used are IS 3025-1964 and revised edition IS 456- 2009.

Silica fume- It is the material obtained from coal industry which is 100 times smaller than the cement.

Superplasticizer- Different superplasticizers are there in the market which is used to reduce water- cement

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ratio, one can use any Superplastizer available in the market with care full instructions and guidance of chaperons. I have been used Tamcem 60R Superplastizer, where it can be used at 1.5 to 2.0 % weight of cement.

All the densities of different materials mentioned above are clearly given in the table number 1.

Table 1: Mix Proportions and Densities Mix No M1 M2 M3 Cement (Kg/m3) 564.29 455.01 505.82 Fine aggregate (Kg/m3) 689.23 727.82 698.02 Coarse aggregate (Kg/m3) 1143.8 1207.83 1187.4 Water(kg/m3) 137.9 137.9 137.9 W/C ratio 0.23 0.27 0.25 Slump 75 80 80 Silica fume (Kg/m3) 42.47 50.55 55.83 Superplasticizer 1.5%of cement 1.5%of cement 1.7% of cement

M4 546.09 689.23 1143.8 137.9 0.23 80 60.67 1.8%of cement

Four trials have been done, in which Mix 4 has obtained the high strength of 70.9 N/mm2. For the comparison of high strength concrete, I have elected the normal grade concrete of M25 grade. The strengths of each cube are clearly mentioned in form of graphs for standard and high strength concrete.

Figure 1: Compressive Strength of M60 Cubes.

Figure 2: Compressive Strength of M25 Cubes.

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Stress Strain Analysis of Standard and High Strength Concrete

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METHODOLOGY FOR STRESS STRAIN ANALYSIS To find the stress and strain the gauge length of the Compress meter and area of cylinder is to calculated.

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The ratio of the gauge value to the gauge length is the strain in cylinder, were as gauge value is the dial reading of the Compressometer.

Strain = Gauge value/Gauge length.

Gauge length is equal to 150mm which is the diameter of the cylinder.

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Stress is calculated by the formula load to the area Stress = Load/area Area =17662.5 mm2.

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Modulus of elasticity = stress / strain Different graphs were plotted for stress strain behavior of each cylinder with various curing periods.

Figure 3: Stress-Strain Graph of M60 Grade Concrete.

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Figure 4: Stress-Strain Graph of M25 Grade Concrete.

The above graphs show the variation in stress-strain of M60 and M25 grade concrete for 28, 56, 90 days of curing.

Figure 5: Comparison of Stress-Strain Graph for M60 Grade and M25 Grade.

CONCLUSIONS •

The trial mix number 4 of M60 grade with 10% replacement of silica fume and 0.23 water- cement ratios gave the satisfactory results with 70.9 N/mm2 for 28days, 72.89 N/mm2 and 77.1 N/mm2 for 90 days of curing.

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The elasticity and strain observed are clearly mentioned in the below given table.

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Age M25 M60

Max stress 25.60 61.7

28 days Strain E(N/mm2) 0.0011 23387.22 0.0016 35061.9

Table 2 56days Max stress Strain 30.26 0.00123 68.65 0.0019

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E(N/mm2) 24808.86 35632.8

Max stress 34.29 72.77

90 days Strain E(N/mm2) 0.0012 28740.83 0.0020 37651.7

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AUTHORS PROFILE

“Bittla Sudheer” currently pursuing Masters in structural engineering from Chandigarh University (CU), Mohali, Punjab, India. He received his bachelor’s degree from Institute of aeronautical engineering college Affliated under Jawaharlal Nehru Technological University, Hyderabad, Telangana, his area of research is on standard concrete and high strength concrete.

“Jagdish Chand” holds a bachelor’s degree in Civil Engineering, master’s degree in Structural Engineering and pursuing his Ph.D. degree from the National Institute of Technology, Kurukshetra. He is an Associate Professor in UIECivil Engineering at Chandigarh University, Mohali. He has over six years of industrial experience and more than twelve years of teaching experience. His area of interest includes cementitious materials, high strength concrete, steel-concrete composite structures.

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